Miscellanea

297 a.k.a. Methane is a chemical compound with the chemical formula CH4. It is the simplest alkane, and the principal component of natural gas. Methane's bond angles are 109.5 degrees. Burning methane in the presence of oxygen produces carbon dioxide and water. The relative abundance of methane makes it an attractive fuel. However, because it is a gas at normal temperature and pressure, methane is difficult to transport from its source.

also known as CH4, Болотний газ, Рудниковий газ

297 a.k.a. Trackdown is an American western television series starring Robert Culp that aired more than seventy episodes on CBS between 1957 and 1959. The series was produced by Dick Powell's Four Star Television and filmed at the Desilu-Culver Studio. Trackdown was a spin-off of Powell's anthology series, Dick Powell's Zane Grey Theater.

begun on 4 October 1957 and completed on 23 September 1959 (55 years ago)